package test;//
// Source code recreated from a .class file by IntelliJ IDEA
// (powered by Fernflower decompiler)
//

import java.math.BigInteger;
import java.util.Date;
import java.util.Random;
import java.util.zip.CRC32;

public class KeyGen {
    public KeyGen() {
    }

    protected static short getCRC(String s, int i, byte[] bytes) {
        CRC32 crc32 = new CRC32();
        int k;
        if (s != null) {
            for (k = 0; k < s.length(); ++k) {
                char byte0 = s.charAt(k);
                crc32.update(byte0);
            }
        }

        crc32.update(i);
        crc32.update(i >> 8);
        crc32.update(i >> 16);
        crc32.update(i >> 24);

        for (k = 0; k < bytes.length - 2; ++k) {
            byte var7 = bytes[k];
            crc32.update(var7);
        }

        return (short) ((int) crc32.getValue());
    }

    protected static String encodeGroups(BigInteger biginteger) {
        BigInteger beginner1 = BigInteger.valueOf(60466176L);
        StringBuilder sb = new StringBuilder();

        for (int i = 0; biginteger.compareTo(BigInteger.ZERO) != 0; ++i) {
            int j = biginteger.mod(beginner1).intValue();
            String s1 = encodeGroup(j);
            if (i > 0) {
                sb.append("-");
            }

            sb.append(s1);
            biginteger = biginteger.divide(beginner1);
        }

        return sb.toString();
    }

    protected static String encodeGroup(int i) {
        StringBuilder sb = new StringBuilder();

        for (int j = 0; j < 5; ++j) {
            int k = i % 36;
            char c;
            if (k < 10) {
                c = (char) (48 + k);
            } else {
                c = (char) (65 + k - 10);
            }

            sb.append(c);
            i /= 36;
        }

        return sb.toString();
    }

    protected static String makeKey(String name, int days, int id, byte version) {
        id %= 100000;
        byte[] bkey = new byte[12];
        bkey[0] = 1;
        bkey[1] = version;
        Date d = new Date();
        long ld = d.getTime() >> 16;
        bkey[2] = (byte) ((int) (ld & 255L));
        bkey[3] = (byte) ((int) (ld >> 8 & 255L));
        bkey[4] = (byte) ((int) (ld >> 16 & 255L));
        bkey[5] = (byte) ((int) (ld >> 24 & 255L));
        days &= '\uffff';
        bkey[6] = (byte) (days & 255);
        bkey[7] = (byte) (days >> 8 & 255);
        bkey[8] = 105;
        bkey[9] = -59;
        bkey[10] = 0;
        bkey[11] = 0;
        short w = getCRC(name, id % 100000, bkey);
        bkey[10] = (byte) (w & 255);
        bkey[11] = (byte) (w >> 8 & 255);
        BigInteger pow = new BigInteger("89126272330128007543578052027888001981", 10);
        BigInteger mod = new BigInteger("86f71688cdd2612ca117d1f54bdae029", 16);
        BigInteger k0 = new BigInteger(bkey);
        BigInteger k1 = k0.modPow(pow, mod);
        String s0 = Integer.toString(id);

        for (String sz = "0"; s0.length() != 5; s0 = sz.concat(s0)) {
            ;
        }

        s0 = s0.concat("-");
        String s1 = encodeGroups(k1);
        s0 = s0.concat(s1);
        return s0;
    }

    public static String key(String username, byte version) {
        Random r = new Random();
        return makeKey(username, 0, r.nextInt(100000), version);
    }

    public static void main(String[] args) {
        String username = "liuteng";
        String version = "14";
        String result = KeyGen.key(username, Byte.parseByte(version));
        System.out.println(result);
    }
}
